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Einstein’s theories are particularly beautiful, as are Maxwell's equations.

This understanding, quantified in Maxwell's equations—a mathematical model for electricity, magnetism and light—laid the foundation for the invention of the dynamo, electricity generation for industries and households, and telecommunications: telegraph, telephone, radio and television.

That though does not mean it is any less real than quantum mechanics or Maxwell’s equations.

The limitations of the spin-1 photon lead to Maxwell’s equations of electromagnetism.

The unification of electricity, magnetism and light in Maxwell’s equations is a highlight of any good physics degree.